Yes, you can tip for Spa services and I tip what I would here at home. I don't know which resort you are going too, but we were at CTI last year and I had my nails done there with our resort credit. Probably wouldn't do it again, as before I got to the room, it was smudged as they don't have the drying machines and lights like my nail salon here and with the humidity, it takes for ever to dry. It was just over $100 for a spa mani & pedi.